Windows XP and Vista only: Dual monitor utility DisplayFusion can set different wallpaper images for each of your desktops or stretch an image across desktops.

If you can't set different backgrounds for dual monitors on Windows 11/10 use this workaround or free tool to set different wallpapers.

To set different wallpapers on dual monitors in Windows 10, you'll need to go to your "Personalize" menu, which you can open with just a click.

Dual Monitor Wallpaper Rob Griffiths at MacOSHints writes, “PlasmaDesign.co.uk is the home to Rob Randtoul’s amazing digital artwork… ...